At the Upper moon meeting, Muzan has send Gyokko and Hantengu to Kill demon slayers and swordsmiths on that night. Also on That night you, Tanjiro and Nezuko were with Muichiro talking and all of the sudden Hantengu walks in the room

Tanjiro: "Huh? An Upper moon!" Muichiro grabs his sword and uses mist breathing on Hantengu Muichiro: "Mist breathing... Fourth form: Shifting Flow Slash." Muichiro tries to use mist breathing but Hantengu dodges his attack and climbs on the ceiling